[PATCH] powerpc: Fix 64 bits vDSO dwarf info for CR register

[Andrew Haley]

Jakub Jelinek writes:
 > On Wed, Oct 17, 2007 at 02:26:50PM +1000, Benjamin Herrenschmidt wrote:
 > > Unfortunately, a bug in gcc cause it to not quite work either, but that
 > > is being fixed separately with something around the lines of:
 > > 
 > > linux-unwind.h:
 > > 
 > >      fs->regs.reg[R_CR2].loc.offset = (long) &regs->ccr - new_cfa;
 > > +    /* CR? regs are just 32-bit and PPC is big-endian.  */
 > > +    fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4;
 > 
 > Small correction.  If vdso is present, then fixing the vdso is all that is
 > needed, the above mentioned code is used only if the vdso is not present
 > (or if glibc doesn't support the vdso).

Perhaps we should test this change with a hacked libgcc, just to make
sure it fixes the bug.

Andrew.

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